Use right version of phpenmod on Debian

[kovacskri]

The debian jessie basebox with PHP 7.0 fails during provision because the task "php-fpm" tries to run the php5enmod command regardless of the version.

TASK [php-fpm : Activate PHP configuration files] ****************************** failed: [default] (item=php-dev) => {"cmd": "php5enmod php-dev", "failed": true, "item": "php-dev", "msg": "[Errno 2] No such file or directory", "rc": 2}

1. Create a box with the following parameters:

• box_name: "drifter/jessie64-base"
• box_url: "https://vagrantbox-public.liip.ch/drifter-jessie64-base.json"
• php_version: 7

2. Run vagrant provision

It should fall back to phpenmod if the PHP version 7 and successfully complete the tasks.